Lineage 2 Adena is the name for the currency used in Lineage 2. It comes from monsters, NPC's, quests, vendors and other players. The best way to make plenty of Adena is to sell items to players. There are certain items like weapons that players need and are willing to buy from other people because of the high prices in stores. Another way is to farm items from quests or monsters and sell these at vendors. This may be a tedious process, but over time your Adena can add up greatly. Clans may also earn Adena by taxing the surrounding lands if they own a Castle in the area.